Towards a Better Understanding of CAR, CDR, CADR and the Others

This article introduces a method for teaching the CAR and CDR extensions. In programming, a container has multiple cells for holding other objects. We use an access language to specify a cell and say what action to take when it is found, such as returning the object in the cell. As an example, in FORTRAN, the primary container is the array, and there is a simple sub-language inside of FORTRAN used for accessing an element within an array. Namely, symbol (index) Here, the parenthesis are literal punctuation, the symbol will represent the base address for an array, and the index will be multiplied by the element size and added to the base address for finding an element.